Journal Published Online: 21 May 2020
Volume 9, Issue 4

Hot Extrusion of a Commercial Aluminum Powder Metallurgy Metal Matrix Composite Material

CODEN: MPCACD

Abstract

Sintered preforms made of an aluminum powder metallurgy (PM) 2000 series metal matrix composite designed for press-and-sinter applications were forward extruded at 450°C under displacement rates of 254 mm/min and 2,032 mm/min. The material was highly responsive to extrusion under these conditions and was readily formed into products that included 10-mm and 15-mm solid round bars as well as C-channel and round tubing profiles, wherein extrusion ratios ranged from 11:1 to 76:1. Significant metallurgical improvements were also observed in the seemingly defect-free products. These included gains in tensile yield strength (10 %), ultimate tensile strength (20 %), and tensile ductility (400 %) when compared to the nonextruded T6 counterpart. Such enhancements were attributed to the attenuation of full theoretical density, disruption of the residual oxide network, and the development of a partial duplex fiber texture with strong <111> and moderate <100> fiber components within the extruded PM products.

Author Information

Wilson, M. F.
Department of Mechanical Engineering, Dalhousie University, Halifax, Nova Scotia, Canada
Sweet, G. A. W.
Department of Mechanical Engineering, Dalhousie University, Halifax, Nova Scotia, Canada
Amegadzie, M. Y.
Department of Mechanical Engineering, Dalhousie University, Halifax, Nova Scotia, Canada
Williams, B. W.
CanmetMATERIALS, Natural Resources Canada, Hamilton, Ontario, Canada
Smith, L. J. B.
GKN Powder Metallurgy, Auburn Hills, MI, USA
Taylor, A.
GKN Powder Metallurgy, Auburn Hills, MI, USA
Hexemer, R. L.
GKN Powder Metallurgy, Auburn Hills, MI, USA
Donaldson, I. W.
GKN Powder Metallurgy, Auburn Hills, MI, USA
Bishop, D. P.
Department of Mechanical Engineering, Dalhousie University, Halifax, Nova Scotia, Canada
Pages: 16
Price: $25.00
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Stock #: MPC20190161
ISSN: 2379-1365
DOI: 10.1520/MPC20190161